diff --git a/EmulatorPkg/Unix/Host/Host.inf b/EmulatorPkg/Unix/Host/Host.inf
index f5ebbed683..1b7481d1e0 100644
--- a/EmulatorPkg/Unix/Host/Host.inf
+++ b/EmulatorPkg/Unix/Host/Host.inf
@@ -124,6 +124,7 @@
    GCC:*_GCC48_X64_CC_FLAGS = "-DEFIAPI=__attribute__((ms_abi))"
    GCC:*_GCC49_X64_CC_FLAGS = "-DEFIAPI=__attribute__((ms_abi))"
    GCC:*_GCC5_X64_CC_FLAGS = "-DEFIAPI=__attribute__((ms_abi))" -flto -DUSING_LTO -Os
+   GCC:*_GCC_X64_CC_FLAGS = "-DEFIAPI=__attribute__((ms_abi))" -flto -DUSING_LTO -Os
    GCC:*_*_X64_PP_FLAGS == -m64 -E -x assembler-with-cpp -include $(DEST_DIR_DEBUG)/AutoGen.h
    GCC:*_*_X64_ASM_FLAGS == -m64 -c -x assembler -imacros $(DEST_DIR_DEBUG)/AutoGen.h